CAS-004 Security Engineering Practice Question
A security architect is designing a PKI for a large enterprise that issues certificates to thousands of users and devices. The architect wants to implement a mechanism to efficiently check certificate revocation status without requiring clients to download a full CRL. Which TWO technologies should be considered?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OCSP stapling
OCSP allows real-time revocation status checking without downloading a CRL. OCSP stapling improves performance by having the server present a signed OCSP response. CRL distribution points are still used but require downloads. Certificate transparency logs are for monitoring, not revocation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CRL distribution points
Why it's wrong here
CRL distribution points require downloading the full CRL.
- ✗
Certificate transparency logs
Why it's wrong here
CT logs are for auditing certificate issuance, not revocation.
- ✓
OCSP stapling
Why this is correct
OCSP stapling allows the server to provide a cached OCSP response, reducing load and improving privacy.
- ✓
Online Certificate Status Protocol (OCSP)
Why this is correct
OCSP provides real-time revocation status.
- ✗
Delta CRL
Why it's wrong here
Delta CRL is smaller but still requires download.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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